Trying a couple of old M39 screw lenses on my 1946-47 LEICA IIIc - here was a Russian JUPITER 135mm f4 tele used at full aperture -- the IIIc Rangefinder does not work with the lens so I had to 'Guess' the Meter Distance setting - FILM was a short Test length of Outdated KB40 rated 80 ASA and processed in home-made ID11 1+1